Pressure sensor

Abstract

A tissue pressure measuring system is disclosed. The system includes a syringe with a cylindrical passage and means for connecting a tissue invasion device in fluid communication with the cylindrical passage. A plug is present within the cylindrical passage and has a diaphragm therein.

What is claimed is: 
     
       1. In a tissue pressure measuring system which comprises a syringe having a cylindrical passage and means for connecting a tissue invasion device in fluid communication with the cylindrical passage, a plug in the cylindrical passage having a passage formed therethrough, means sealing the periphery of the plug in fluid tight moveable relationship with the interior of the cylindrical passage, a resilient pressure transmitting diaphragm sealing the passage through the plug and a cylindrical pressure measuring instrument connected to the plug for moving the plug in the cylindrical passage and for sensing pressure transmitted through the diaphragm, the improvement wherein the diaphragm is a membrane formed of inert resilient material fitted inside the interior of the plug, said diaphragm having a substantially flat center portion and an annular portion having a substantially arcuate cross-section around the center point.